Hey, I have a camper special from '74 but I don't remember these. Must have been an option? Mine is a 'heavy-half' 1/2 ton.
Some of the other equipment was about a mile of 0 gauge cable running everywhere with two batteries, a big A/B switch on the driver floor in front of the seat, a big electrical plug in the upper driver cab corner, 12 bolt limited slip with a 3.40 gear.
It's strange though it was just a 2WD 2 bbl 350 three on the tree.
I don't have original pics to share- it's been through many changes.
This was the last go 'round. Believe it or not I tore it down for a frame off resto and a 3 inch body drop.... and other things.
Still working on it! This pic was shot Aug of '02